WIP: Eliminate event.target() usage from TrayEventFilter

ash/shell_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SHELL_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 10 matching lines @@
 }
 
 namespace aura {
 class Window;
 }
 
 namespace gfx {
 class Image;
 }
 
+namespace keyboard {
+class KeyboardUI;
+}
+
 namespace ui {
 class MenuModel;
 }
 
-namespace keyboard {
-class KeyboardUI;
+namespace views {
+class Widget;
 }
 
 namespace ash {
 
 class AccessibilityDelegate;
+class ContainerDelegate;
 class MediaDelegate;
 class NewWindowDelegate;
 class PointerWatcherDelegate;
 class SessionStateDelegate;
 class ShelfDelegate;
 class ShelfModel;
 class SystemTrayDelegate;
 class UserWallpaperDelegate;
 class Shelf;
 struct ShelfItem;
@@ skipping 84 matching lines @@
 
   // Creates an application delegate. Shell takes ownership of the delegate.
   virtual NewWindowDelegate* CreateNewWindowDelegate() = 0;
 
   // Creates a media delegate. Shell takes ownership of the delegate.
   virtual MediaDelegate* CreateMediaDelegate() = 0;
 
   virtual std::unique_ptr<PointerWatcherDelegate>
   CreatePointerWatcherDelegate() = 0;
 
+  virtual std::unique_ptr<ContainerDelegate> CreateContainerDelegate() = 0;
+
   // Creates a menu model for the |shelf| and optional shelf |item|.
   // If |item| is null, this creates a context menu for the desktop or shelf.
   virtual ui::MenuModel* CreateContextMenu(ash::Shelf* shelf,
                                            const ash::ShelfItem* item) = 0;
 
   // Creates a GPU support object. Shell takes ownership of the object.
   virtual GPUSupport* CreateGPUSupport() = 0;
 
   // Get the product name.
   virtual base::string16 GetProductName() const = 0;
 
   virtual void OpenKeyboardShortcutHelpPage() const {}
 
   virtual gfx::Image GetDeprecatedAcceleratorImage() const = 0;
 
   // Toggles the status of the touchpad / touchscreen on or off.
   virtual void ToggleTouchpad() {}
   virtual void ToggleTouchscreen() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_